Method for decomposition of Michael type adduct

Abstract

A method for the decomposition of a Michael type adduct of an acrylic acid and/or an acrylic ester represented by the following formula [I] or [II] is disclosed, wherein decomposing the Michael type adduct in the presence of at least one copper salt and at least one metal salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt into an acrylic acid and/or an acrylic ester and/or an alcohol. CH 2 ═CHCOO(—X—COO) n —R 1   [I] R 2 —O(—X—COO) m —R 3   [II] (wherein n and m denote an integer in the range of 1-5, R 1 , R 2 , and R 3 independently denote a hydrogen atom or an alkyl group, and —X— denotes —CH 2 CH 2 — or —CH(CH 3 )—, and —X— may be identical or different when n is 2 or more).

1. A method for the decomposition of an adduct of an acrylic acid and/or an acrylic ester represented by the following formula [I] or [II], wherein decomposing the adduct in the presence of at least one copper salt and at least one metal salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt into an acrylic acid and/or an acrylic ester and/or an alcohol used as raw materials in production or a relevant acrylic and/or acrylic ester
   CH 2 ═CHCOO(—X—COO) n —R 1   [I] 
 
       wherein n denotes an integer in the range of 1-5, R 1  denotes a hydrogen ato or an alkyl group, and —X— denotes —CH 2 CH 2 — or —CH(CH 3 )—, and —X— may be identical or different when n is 2 or more.
   R 2 —O(—X—COO) m —R 3   [II] 
 
       wherein m denotes an integer in the range of 1-5, R 2  and R 3  independently denote a hydrogen atom or an alkyl group, and —X— denotes —CH 2 CH 2 — or —CH(CH 3 )—, and —X— may be identical or different when n is 2 or more. 
     
     
       2. A method according to  claim 1 , wherein decomposing the adduct in the presence of 4,4′.4′-tris-(2,2.6,6-tetramethyl piperidinoxyl) phosphite or 2,2,6,6-tetramethyl piperidinoxyls represented by the following formula (1) 
                 
 
       wherein R 1  denotes CH 2 , CHOH, CHCH 2 OH, CHCH 2 ,CH 2 OH, CHOCH 2 OH. CHOCH 2 CH 2 OH, CHCOOH, or C═O and R 2  denotes a hydrogen atom or CH 2 OH in addition to the copper salt and the metal salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt. 
     
     
       3. A method for the production of an acrylic acid and/or an acrylic ester, which comprises a step of recovering an adduct of an acrylic acid and/or an acrylic ester formed in the process for producing acrylic acid or an acrylic ester and a step of decomposing the recovered adduct of an acrylic acid and/or an acrylic ester in the presence of at least one copper salt and at least one metal salt selected from the group consisting of an alkali metal salt and alkaline earth metal salt into an acrylic acid and/or an acrylic ester and/or an alcohol used as raw materials in the production of a relevant acrylic acid and/or acrylic ester. 
     
     
       4. A method according to  claim 3 , which further comprises, subsequently to the step of decomposing the adduct of an acrylic acid and/or an acrylic ester, a step of returning at least one compound selected from the group consisting of the acrylic acid, the acrylic ester, and the alcohol obtained by the decomposition of the adduct of an acrylic acid and/or an acrylic ester to a step in the process for producing an acrylic acid and an acrylic ester.